Engineering Mehanics MCQ

Q. A force is completely defined when we specify

(A) magnitude

(B) direction

(C) point of application

(D) all of the above

Answer:  D   

Q. Forces are called concurrent when their line of actions meet at

(A) one point

(B) two point

(C) plane

(D) perpendicular plane

Answer:  A   

Q. According to Lami’s theorem 

(A) the three forces must be equal

(B) the three forces must be at 120 degree to each other

(C) the three forces must be in equilibrium

(D) When three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two forces

Answer:  D   

Q. Determine the total magnitude of the vector \(\vec{a}\)=6\(\hat{i}\)+8\(\hat{j}\) . 

(A) 28

(B)  5

(C)  10

(D)  8

Answer:  C   

Q. The forces acting on a body of mass 15 kg are as follows :

\(\vec{X}\)=5\(\hat{i}\)-6\(\hat{j}\) +10\(\hat{k}\)

\(\vec{Y}\)=3\(\hat{i}\)+2\(\hat{j}\) +3\(\hat{k}\)

\(\vec{Z}\)=-4\(\hat{i}\)+\(\hat{j}\)-\(\hat{k}\)

what is the magnitude of the net force on the body?

(A) 19

(B)  13

(C)  10

(D)  8

Answer:  B   

Q. Which is not a fundamental unit? 

(A) Mass

(B)  Length

(C)  Time

(D)  Force

Answer:  D   

Q. The resultant of two forces P and Q acting along the same straight line ,but in opposite direction is given by:

(A) P+Q

(B)  P-Q

(C)  P/Q

(D)  Q/P

Answer:  B   

Q. Which of the following is a scalar quantity?

(A) Force

(B)  Acceleration

(C)  Speed

(D)  Velocity

Answer:  C   

Q. Which of the following is a scalar quantity?

(A) Force

(B)  Acceleration

(C)  Work

(D)  Momentum

Answer:  C   

Q. Two forces of same magnitude P are  acting at a point perpendicular to each other, then magnitude of their resultant will be ______

(A)  \(\sqrt{2}\)P

(B) \(\sqrt{3}\)P

(C) \(\sqrt{3}\)P/2

(D)  2P

Answer:  B   

Q.Two forces of same magnitude P are having an angle of 60 degree between them are acting at a point, the magnitude of the resultant will be ______

(A)  \(\sqrt{P}\)

(B) \(\sqrt{2P}\)

(C) \(\sqrt{2}\)P

(D)  Zero

Answer:  C   

Q. The pair of physical quantities having the same unit is

(A)  Thrust and weight

(B) Thrust and pressure

(C) Force and pressure

(D)  Weight and pressure

Answer:  A   

Q. When trying to turn a key into the lock, which of the following is applied

(A)  Coplanar forces

(B) Non Coplanar forces

(C) Moment

(D)  Couple

Answer:  D   

Q. If the arm of couple is doubled, then moment of that couple would 

(A)  remains same

(B) be doubled

(C) be halved

(D)  none of these

Answer:  B   

Q. A couple is formed when

(A)  two unequal and unlike parallel force acting on a body

(B) two unequal and like parallel force acting on a body

(C) two equal and unlike parallel force acting on a body

(D) two unequal and like parallel force acting on a body

Answer:  C   

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